I can mention that there are slight differences in bearings between 'early' and 'late' W5x at least.
I did a document up many moons ago that highlighted some of the difference between early and late w5x that I could identify. If you want to PM me your email address I'll forward it on to you
Otherwise for early W5x I'd personally expect them to be the same, but don't have first hand info... have you tried checking the EPC?
Cheers
Wilbo
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